Characteristic

Group A (n = 2209)

Group B (n = 2310)

P

Maternal age (years)

≥30

<30

1489 (67.4%)

720 (32.6%)

1483 (64.2%)

827 (35.8%)

P < 0.05

P < 0.05

Gynecological diseases in the past medical history

1953 (88.4%)

2107 (91.2%)

Р < 0.05

Outcomes of previous pregnancies

Full term birth

Premature birth

Fetal and congenital malformations

Fetal death (stillbirth)

Induced abortion

Miscarriage

1

2

3 and more

Missed miscarriage

Anembryonic pregnancy (blighted ovum)

Intrauterine growth restriction

528 (23.9%)

60 (2.7%)

82 (3.7%)

53 (2.4%)

371 (16.8%)

581 (26.3%)

985 (44.6%)

596 (27%)

400 (18.1%)

75 (3.4%)

176 (8%)

566 (24.5%)

51 (2.2%)

67 (2.9%)

62 (2.7%)

418 (18.1%)

621 (26.9%)

1088 (47.1%)

573 (24.8%)

411 (17.8%)

90 (3.9%)

166 (7.2%)

Р > 0.05

Р > 0.05

Р > 0.05

Р > 0.05

Р > 0.05

Р > 0.05

Р > 0.05

Р > 0.05

Р > 0.05

Р > 0.05

Р > 0.05